[RFC PATCH 00/12] Ion cleanup in preparation for moving out of staging
Brian Starkey
brian.starkey at arm.com
Fri Mar 10 02:31:13 PST 2017
Hi,
On Thu, Mar 09, 2017 at 09:38:49AM -0800, Laura Abbott wrote:
>On 03/09/2017 02:00 AM, Benjamin Gaignard wrote:
[snip]
>>
>> For me those patches are going in the right direction.
>>
>> I still have few questions:
>> - since alignment management has been remove from ion-core, should it
>> be also removed from ioctl structure ?
>
>Yes, I think I'm going to go with the suggestion to fixup the ABI
>so we don't need the compat layer and as part of that I'm also
>dropping the align argument.
>
Is the only motivation for removing the alignment parameter that
no-one got around to using it for something useful yet?
The original comment was true - different devices do have different
alignment requirements.
Better alignment can help SMMUs use larger blocks when mapping,
reducing TLB pressure and the chance of a page table walk causing
display underruns.
-Brian
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